commit ee1d79c3f0f871bf78f20930cb1a2441f28ac027
author Sean Christopherson <seanjc@google.com> Wed Jun 05 15:45:27 2024 -0700
committer Sean Christopherson <seanjc@google.com> Tue Jun 11 06:41:23 2024 -0700
tree bc6bc81931bc1c76c68f5c6536089a875649f3d1
parent 184ee0d5d351527a51f35fd58ecc6ab42f1fc577

nVMX: Verify KVM actually loads the value in HOST_PAT into the PAT MSR

Check that the PAT MSR is actually loaded with vmcs.HOST_PAT on VM-Exit
in the testcase that shoves all legal PAT values into HOST_PAT.

Link: https://lore.kernel.org/r/20240605224527.2907272-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

x86/vmx_tests.c

diff --git a/x86/vmx_tests.c b/x86/vmx_tests.c
index 47527d0..ffe7064 100644
--- a/x86/vmx_tests.c
+++ b/x86/vmx_tests.c
@@ -7275,6 +7275,11 @@
 					error = 0;
 
 				test_vmx_vmlaunch(error);
+
+				if (!error)
+					report(rdmsr(MSR_IA32_CR_PAT) == val,
+					       "Expected PAT = 0x%lx, got 0x%lx",
+						val, rdmsr(MSR_IA32_CR_PAT));
 				wrmsr(MSR_IA32_CR_PAT, pat_msr_saved);
 
 				report_prefix_pop();